/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright 2010 huliqing, huliqing.cn@gmail.com
 *
 * This file is part of QFaces.
 * QFaces is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * QFaces is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with QFaces.  If not, see <http://www.gnu.org/licenses/>.
 *
 * 这个文件是QFaces的一部分。
 * 您可以单独使用或分发这个文件，但请不要移除这个头部声明信息.
 * QFaces是一个自由软件，您可以自由分发、修改其中的源代码或者重新发布它，
 * 新的任何修改后的重新发布版必须同样在遵守LGPL3或更后续的版本协议下发布.
 * 关于LGPL协议的细则请参考COPYING、COPYING.LESSER文件，
 * 您可以在QFaces的相关目录中获得LGPL协议的副本，
 * 如果没有找到，请连接到 http://www.gnu.org/licenses/ 查看并获取副本。
 *
 * - Author: Huliqing
 * - Contact: huliqing.cn@gmail.com
 * - License: GNU Lesser General Public License (LGPL)
 * - Blog and source code availability: http://www.huliqing.name/
 */

package name.huliqing.qfaces.component;

import javax.el.ValueExpression;
import javax.faces.component.StateHolder;
import javax.faces.component.UIParameter;
import javax.faces.context.FacesContext;

public class SaveState extends UIParameter {

	public final static String COMPONENT_FAMILY = "javax.faces.Parameter";

	public SaveState() {
		setRendererType(null);
	}

	@Override
	public Object saveState(FacesContext fc) {
		Object values[] = new Object[3];
		values[0] = super.saveState(fc);
		Object valueObj = getValue();
		if (valueObj instanceof StateHolder) {
			values[1] = Boolean.TRUE;
			values[2] = saveAttachedState(fc, valueObj);
		} else {
			values[1] = Boolean.FALSE;
			values[2] = valueObj;
		}
		return values;
	}

	@Override
	public void restoreState(FacesContext fc, Object state) {
		Object values[] = (Object[]) state;
		super.restoreState(fc, values[0]);

		Object valueObj;
		Boolean isStateHolder = (Boolean) values[1];
		if (Boolean.TRUE.equals(isStateHolder)) {
			valueObj = restoreAttachedState(fc, values[2]);
		} else {
			valueObj = values[2]; 
		}
		ValueExpression vb = getValueExpression("value");
		if (vb != null) { 
			vb.setValue(fc.getELContext(), valueObj);
		}
	}

	@Override
	public String getFamily() {
		return COMPONENT_FAMILY;
	}

}
